diff --git a/dviwin.cpp b/dviwin.cpp
index bacbcffab..f2b0cd9fe 100644
--- a/dviwin.cpp
+++ b/dviwin.cpp
@@ -109,7 +109,7 @@ dviWindow::dviWindow( int bdpi, const char *mfm, const char *ppr,
 {
 	ChangesPossible = 1;
 	showsbs = 1;
-	FontPath = QString(NULL);
+	FontPath = QString::null;
 	setBackgroundColor( white );
 	setUpdatesEnabled(FALSE);
 	setFocusPolicy(QWidget::StrongFocus);
diff --git a/dviwin.h b/dviwin.h
index 409c0225d..7b4aaba6f 100644
--- a/dviwin.h
+++ b/dviwin.h
@@ -54,7 +54,7 @@ signals:
 	void		currentPosChanged( QPoint );
 	void		shrinkChanged( int shrink );
 	void		fileChanged();
-	void		statusChange( const char * );
+	void		statusChange( const QString & );
 	void		setPoint( QPoint p );
 
 public slots:
diff --git a/kdvi.cpp b/kdvi.cpp
index b79f33c4e..78dfa55ed 100644
--- a/kdvi.cpp
+++ b/kdvi.cpp
@@ -53,7 +53,7 @@ kdvi::kdvi( char *fname, QWidget *, const char *name )
 	setMinimumSize( 400, 60 );
 	setCaption( kapp->getCaption() );
 	tipgroup = new QToolTipGroup( this, "TipGroup" );
-	connect( tipgroup, SIGNAL(showTip(const char *)), SLOT(showTip(const char *)) );
+	connect( tipgroup, SIGNAL(showTip(const QString &)), SLOT(showTip(const QString &)) );
 	connect( tipgroup, SIGNAL(removeTip()), SLOT(removeTip()) );
 
   // Create KPanner for toolBar2 and dviwindow
@@ -72,8 +72,8 @@ kdvi::kdvi( char *fname, QWidget *, const char *name )
 	connect( dviwin, SIGNAL(currentPage(int)), SLOT(setPage(int)) );
 	connect( dviwin, SIGNAL(shrinkChanged(int)), SLOT(shrinkChanged(int)) );
 	connect( dviwin, SIGNAL(fileChanged()), SLOT(fileChanged()) );
-	connect( dviwin, SIGNAL(statusChange(const char *)),
-			 SLOT(showTip(const char *)) );
+	connect( dviwin, SIGNAL(statusChange(const QString &)),
+			 SLOT(showTip(const QString &)) );
 	connect( dviwin, SIGNAL(setPoint(QPoint)), SLOT(showPoint(QPoint)) );
 
   // Create a menubar
@@ -296,16 +296,16 @@ void kdvi::makeToolBar2(QWidget *parent)
 		 sbox, SLOT(setViewSize( QSize )) );
 	connect( dviwin, SIGNAL(currentPosChanged( QPoint )),
 		 sbox, SLOT(setViewPos( QPoint )) );
-	QToolTip::add( sbox, 0, tipgroup, i18n("Scroll window and switch the page") );
+	QToolTip::add( sbox, "", tipgroup, i18n("Scroll window and switch the page") );
 	sbox->setFixedSize(70,80);
 	gl->addWidget( sbox );
 
   // Create a MarkList
 
 	marklist = new MarkList( toolBar2 );
-	connect( marklist, SIGNAL(selected(const char *)),
-		SLOT(pageActivated(const char *)) );
-	QToolTip::add( marklist, 0, tipgroup, i18n("Select page and mark pages for printing") );
+	connect( marklist, SIGNAL(selected(const QString &)),
+		SLOT(pageActivated(const QString &)) );
+	QToolTip::add( marklist, "", tipgroup, i18n("Select page and mark pages for printing") );
 
 	gl->addWidget( marklist );
 	gl->activate();
@@ -506,7 +506,7 @@ void kdvi::openFile( QString name)
 	if ( name.isEmpty() )
 		return;
 	QString oname( name );
-	name.detach();
+	//name.detach();
 	if ( ! QFileInfo( name ).isReadable() )
 		name.append( ".dvi" );
 	if ( ! QFileInfo( name ).isReadable() )
@@ -702,7 +702,7 @@ PageDialog::PageDialog() : QDialog( 0, 0, 1 ),
 void kdvi::pageGoto()
 {
 	PageDialog dlg;
-	connect( &dlg, SIGNAL(textEntered(const char *)), SLOT(pageActivated(const char *)) );
+	connect( &dlg, SIGNAL(textEntered(const QString &)), SLOT(pageActivated(const QString &)) );
 	dlg.show();
 }
 
@@ -856,9 +856,9 @@ void kdvi::pannerChanged()
 	}
 }
 
-void kdvi::pageActivated( const char * text)
+void kdvi::pageActivated( const QString & text)
 {
-	int pg = QString(text).toInt();
+	int pg = text.toInt();
 	if (dviwin->page() != pg)
 		dviwin->gotoPage( pg );
 	dviwin->setFocus();
@@ -940,7 +940,7 @@ void kdvi::fileChanged()
 	setPage();
 }
 
-void kdvi::showTip( const char * tip)
+void kdvi::showTip( const QString & tip)
 {
 	message( tip );
 }
diff --git a/kdvi.h b/kdvi.h
index a9c18cd20..03a9de3b7 100644
--- a/kdvi.h
+++ b/kdvi.h
@@ -72,7 +72,7 @@ private slots:
 //	void		helpAbout();
 //	void		helpAboutQt();
 	void		pannerChanged();
-	void		pageActivated(const char *);
+	void		pageActivated(const QString &);
 	void		setPage(int p=0);
 	void		selectLarge();
 	void		selectSmall();
@@ -84,7 +84,7 @@ private slots:
 	void		openFile(QString name);
 	void		dropEvent( KDNDDropZone * dropZone );
 	void		updateMarklist();
-	void		showTip( const char *);
+	void		showTip( const QString &);
 	void		removeTip( );
 	void		showPoint( QPoint );
 
@@ -154,7 +154,7 @@ class PageDialog : public QDialog
 public:
 	PageDialog();
 signals:
-	void textEntered(const char *);
+	void textEntered(const QString &);
 private slots:
 	void go() { emit textEntered(ed.text()); accept();}
 private:
diff --git a/marklist.h b/marklist.h
index 6852ad84e..40abc11ee 100644
--- a/marklist.h
+++ b/marklist.h
@@ -50,7 +50,7 @@ public slots:
 
 signals:
 	void	selected( int index );
-	void	selected( const char * text );
+	void	selected( const QString & text );
 
 protected:
 	void	mousePressEvent ( QMouseEvent* );